Wandzin [ˈvand͡ʑin] is a settlement in the administrative district of Gmina Sidra, within Sokółka County, Podlaskie Voivodeship, in north-eastern Poland. It lies approximately 2 kilometres (1 mi) east of Sidra, 18 km (11 mi) north of Sokółka, and 53 km (33 mi) north of the regional capital Białystok.